#courseCategory{
    width: 100%;
    height: 100%;
    background-color:rgb(24,144,255);
}
#rootNode{
    width: 200px;
    height: 100%;
    margin-left: 30%;
    background-color: #71dd8a;
}
.categoryOne{
    width: 100%;
    height: 5%;
    border: red 1px solid;
}
.categoryTwo{
    width: 100%;
    height: 4%;
    border: #007bff 1px solid;
    position: relative;
    top: 0;
    left: 30px;
}